20713663 has 2 divisors, whose sum is σ = 20713664. Its totient is φ = 20713662.

The previous prime is 20713657. The next prime is 20713669. The reversal of 20713663 is 36631702.

It is a balanced prime because it is at equal distance from previous prime (20713657) and next prime (20713669).

It is a cyclic number.

It is not a de Polignac number, because 20713663 - 2⁵ = 20713631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20713669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10356831 + 10356832.

It is an arithmetic number, because the mean of its divisors is an integer number (10356832).

Almost surely, 2^20713663 is an apocalyptic number.

20713663 is a deficient number, since it is larger than the sum of its proper divisors (1).

20713663 is an equidigital number, since it uses as much as digits as its factorization.

20713663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 20713663 is about 4551.2265379785. The cubic root of 20713663 is about 274.6327350772.

The spelling of 20713663 in words is "twenty million, seven hundred thirteen thousand, six hundred sixty-three".